INFO: task syz.6.397:9294 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.397       state:D stack:25128 pid:9294  tgid:9293  ppid:8881   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x5fd/0x8f0
 down_read+0x98/0x2e0
 super_lock+0x2a9/0x3b0
 user_get_super+0xc8/0x120
 __se_sys_quotactl+0x4da/0x950
 do_syscall_64+0xfa/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc4e318f6c9
RSP: 002b:00007fc4e3f91038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007fc4e33e5fa0 RCX: 00007fc4e318f6c9
RDX: 0000000000000000 RSI: 00002000000000c0 RDI: ffffffff80000900
RBP: 00007fc4e3211f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc4e33e6038 R14: 00007fc4e33e5fa0 R15: 00007fffb4bf52a8
 </TASK>

Showing all locks held in the system:
4 locks held by kworker/u8:0/12:
1 lock held by khungtaskd/34:
 #0: ffffffff8df3d6e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
3 locks held by kworker/u9:2/215:
 #0: ffff888100089948 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc900035d7ba0 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffffffff8f2cbd48 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0xe/0x60
1 lock held by dhcpcd/5559:
 #0: ffffffff8f2cbd48 (rtnl_mutex){+.+.}-{4:4}, at: devinet_ioctl+0x323/0x1b50
2 locks held by getty/5643:
 #0: ffff888175aa10a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400
2 locks held by syz-executor/6593:
1 lock held by syz.6.397/9294:
 #0: ffff8881a74120e0 (&type->s_umount_key#70){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.0.472/10001:
 #0: ffff8881a74120e0 (&type->s_umount_key#70){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.6.565/11010:
 #0: ffff8881a74120e0 (&type->s_umount_key#70){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.2.777/12729:
 #0: ffff8881a74120e0 (&type->s_umount_key#70){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
2 locks held by syz-executor/13077:
 #0: ffffffff8ea5d1e0 (&ops->srcu#2){.+.+}-{0:0}, at: rtnl_link_ops_get+0x23/0x250
 #1: ffffffff8f2cbd48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x8e9/0x1c80
1 lock held by syz.5.821/13123:

=============================================

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 34 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250
 nmi_cpu_backtrace+0x39e/0x3d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 watchdog+0xf60/0xfa0
 kthread+0x711/0x8a0
 ret_from_fork+0x4bc/0x870
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5280 Comm: kworker/0:3 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: events drain_vmap_area_work
RIP: 0010:unwind_next_frame+0x374/0x2390
Code: ea 48 01 d2 48 01 f2 48 bd 00 00 00 00 00 fc ff df 0f 84 37 01 00 00 4c 8d 62 04 4c 8d 6a 05 4c 89 e0 48 c1 e8 03 0f b6 04 28 <84> c0 0f 85 6d 19 00 00 4c 89 e8 48 c1 e8 03 0f b6 04 28 84 c0 0f
RSP: 0018:ffffc900031672d8 EFLAGS: 00000a02
RAX: 0000000000000000 RBX: ffffffff8f8fa768 RCX: ffffffff8f8fa76c
RDX: ffffffff9009b096 RSI: ffffffff9009b096 RDI: ffffffff8bbf0880
RBP: dffffc0000000000 R08: 0000000000000001 R09: ffffffff81738c45
R10: ffffc900031673f8 R11: ffffffff81ac2e10 R12: ffffffff9009b09a
R13: ffffffff9009b09b R14: ffffc900031673a8 R15: ffffffff8f8fa768
FS:  0000000000000000(0000) GS:ffff88818eb3b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007efc375f8580 CR3: 000000016cd9e000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 save_stack+0xf5/0x1f0
 __reset_page_owner+0x71/0x1f0
 __free_frozen_pages+0xbc4/0xd30
 kasan_depopulate_vmalloc_pte+0x6d/0x90
 __apply_to_page_range+0xb66/0x13d0
 kasan_release_vmalloc+0xa2/0xd0
 purge_vmap_node+0x214/0x8f0
 __purge_vmap_area_lazy+0x7a4/0xb40
 drain_vmap_area_work+0x27/0x40
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x4bc/0x870
 ret_from_fork_asm+0x1a/0x30
 </TASK>
